Double Power Supplies and Cross-zero Clocks Lead to Low Noises and High Efficiency in Digital Integrated Circuits

Double power supplies are widely used in analog integrated circuits for the sake of power export and dynamic ranges. By contrast, single power supply and the ground line are regular in digital integrated circuits so far. In this paper, it is shown that double power supplies with cross-zero clocks help decrease the power consumption and noises in digital integrated circuits. They are firstly explained in frequency domain and then by a three-level energy system.

A Reading of Community

The thinking about the idea, forms and practices of communitas has developed a specific discourse in political philosophical writing since the 1980s. This paper retraces the ways in which Jean-Luc Nancy established a “community of writing [and] the writing of community,” how in his view community compears with philosophical writing. Taking Nancy’s discussion as a ground line, the author modulates the perspective on writing—as both text and practice—and focuses on the confrontation with community in reading. By poetologically tackling Nancy’s essay “The Confronted Community” (2001), she investigates into the text’s performing of community and the affective interaction between text and corporeality. Her reading of Nancy’s writing thus activates not only its ecstatic valences leading towards the proposed community of those who have no community; it also uncovers the aesthetic, social and political implications that emanate from Nancy’s writing in this situated reading. Therefore, this paper analytically retraces the textual micro-performances of community in writing as a performative confrontation entailed in reading.

Effects of visual blur and contrast on spatial and temporal precision in manual interception

The visual system is said to be especially sensitive towards spatial but lesser so towards temporal information. To test this, in two experiments, we systematically reduced the acuity and contrast of a visual stimulus and examined the impact on spatial and temporal precision (and accuracy) in a manual interception task. In Experiment 1, we blurred a virtual, to-be-intercepted moving circle (ball). Participants were asked to indicate (i.e., finger tap) on a touchscreen where and when the virtual ball crossed a ground line. As a measure of spatial and temporal accuracy and precision, we analyzed the constant and variable errors, respectively. With increasing blur, the spatial and temporal variable error, as well as the spatial constant error increased, while the temporal constant error decreased. Because in the first experiment, blur was potentially confounded with contrast, in Experiment 2, we re-ran the experiment with one difference: instead of blur, we included five levels of contrast matched to the blur levels. We found no systematic effects of contrast. Our findings confirm that blurring vision decreases spatial precision and accuracy and that the effects were not mediated by concomitant changes in contrast. However, blurring vision also affected temporal precision and accuracy, thereby questioning the generalizability of the theoretical predictions to the applied interception task.

Current Detection Methods of Partial Discharge for Distribution Network Switchgear

There are many factors that can lead to partial discharge in the internal of switchgear. High-frequency current will be generated on the inner wall of switchgear when the electromagnetic wave generated by partial discharge reaches the enclosure of switchgear. In the same way, more complex current signal will be produced on the outer wall of the switchgear because of the electromagnetic radiation outside the enclosure. These two currents will flow to earth through the switchgear ground wire. We can determine whether the switchgear exist partial discharge and the severity of the partial discharge by comparing the current flowing through the outer wall and the total current flowing through the ground line.